Resiliently mounted cultivator tool



April 20, 1948. T. BROWN 2,439,921

RESILIENTLY MOUNTED CULTIVATOR TOOL Filed April 7, 1944 l2 l3 8 I8 33\ INVENTOR. THEOPHILUS BROWN WITNESS T E. B. BJURSTROM ATTORNEYS Patented Apr. 20, 1948 Theophilus-Brown, -Moline, I-ll.,...assi gnor .to. Deere -& sGompany Moline, 111., .a corporation of Ill-inois Application rhpr il 7, 1944, Scrial;N0.': '30',0l7

:The present inventionzrelatesi enerally:to agricultural implements and -mQrc particularly ?-to cultivators.

The object and general mature-of the present invention -is-the;;provision of an improved mounting for cultivator shovels in which the construction is simplifiedand v.thecost-of manufacture appreciablyrreduced, v.andit isa further feature of this invention to provide an improved .cultivator shovel mountin in which the effect of a,

spring release trip is secured but without any extraneous moving parts. .More specifically it-i-s .a feature of this invention to provide a coi-lsspring membersas the sole connection between 121.: culti- .vatorshove-l and the supportingrshankrtherefor.

It is an additional featureof-this invention to provide a coil spring connection between a shovel and its supporting shank, so arranged that the cultivator shovel will yieldnas when encountering member of a cultivator, and pivotally secured to the lower end of the shank I is a foot piece 2 having a bifurcated section represented by arms 3 which are disposed on opposite sides of the lower end of the cultivator shank I. A bolt 4 forms the pivot between these parts, and the upper end of each of the arm sections 3 is slotted. as at I, and receives a clamping bolt 8 by which the position of the foot piece on the lower end of the shank I may be adjusted, as desired.

The foot piece 2 is provided with a pair of shoulders II and I2 disposed in laterally spaced apart relation, and between the shoulders II and I2 is a spring receiving socket I3. A bracket I! is secured, as by bolts I8 and I9, to a shovel 2| of conventional construction, the bracket I1 having attaching flange sections 22 and 23 and a pair of shoulders 24 spaced apart and formed to butt against the shoulders II and I2 mentioned above. Between the shoulders .24 on the bracket I1 is a spring socket 25. The members 2 and I1 preferably are castings, and the spring sockets .,3 Claims. (Cl. 97-184) ,l-3.:and.-25 thereof are formed by cores when the castingsiare made. Preferably, thespring receiving sockets I 3 and .25 are provided with grooves 2 8.-and 29, :thesebeing in the nature of screw threads and receiving theends of a fairly rigid coil spring 30 in screw threaded relation. In order tosecure the desired rigidity, a spring 3%] .of .the pro-stressed t pe is employed. A spring ofthis type -:is well known in the .art, usually .being faor-medcold. Ina Dre-stressed spring, the

.initi'altension .is usuallyproduced by partly .overlapping the wire as it is ,fedinto. the coiling machine, .andinthisk-ind :of ,a, spring, a considerable load must be appliedbefore the initial tension is overcome, after which further loads serve to elongatethespring. A-spring-of this type therefore possesses considerable initial resistance against buckling. A tappedboss-BZ. is formedon each of the membersZand IL- nd each boss is adapted to receive a-set screw-33 having an inner pointed end. 34. .Eachboss "32 has itsthreaded hole 35 disposed So as to position the pointed end of the associated set screw 33 in between two adjacent turns of the spring 30, as best shown in Figure 1, whereby tightening the two set screws 33 firmly fixes the opposite ends of the spring 30 in the sockets I3 and 25.

In assembling the device, the spring 30 may first be screwed into the socket I3, and then the bracket 11, with or without the shovel 2| attached thereto, may be screwed onto the other end of the spring 30 until the shoulders II and I2 register with and engage the shoulders 24. If desired, further tension may be put into the spring 30 by giving the bracket I I the proper turn, after which the set screws 33 will be tightened. It will be observed from Figure 1 that the shoulders I I, I2 and 24 are of such height that there is a considerable space S in the central portion of the spring where it is unconnected with the associated sockets and therefore free to flex as may be necessary. Ordinarily, the spring 30 is of suffrcient strength to hold the shovel 2! in position against all forces normally encountered. However, if the shovel 2| should strike a rock or other obstruction, the spring is free to flex within the space S so that the shovel can pass over the obstruction, after which the spring 30'wil1 restore the shovel to its normal operating position.

It will be observed that by virtue of my invention a simple, sturdy and inexpensive shovel mounting for cultivators has been provided, and one in which without any moving parts, such as pivots, toggle springs and the like, the effect of a spring trip device is secured.

porting part having a downwardly and forwardly facing spring-receiving socket at the lower end of said part, a tool carrying part having an upwardly facing spring-receiving socket, a pair of downwardly and forwardly facing abutment shoulders on said tool-supporting part on opposite sides of the associated socket, a second pair of abutment shoulders facing upwardly and rearwardly and carried on said tool-carrying part on opposite sides of the associated socket and facing and contacting said first mentioned abutment shoulders, a spring member disposed in a downwardly and forwardly extending line and fixed at its rear end in the spring receiving socket of said supporting part and fixed at its forward end in the spring receiving socket in said tool-carrying part, said spring being disposed in a downwardly and forwardly extending line, and a tool fixed to said tool-carrying part and having a point positioned substantially in line with said spring forwardly and downwardly thereof.

2. In an agricultural implement, a tool-supporting part having a downwardly and forwardly facing spring-receiving socket at the lower end of said part, a tool carrying part having an upwardly facing spring-receiving socket, a spring member disposed in a downwardly and forwardly extending line and fixed at its rear end in the spring receiving socket of said supporting part and fixed at its forward end in the spring receiv- 4 ing socket in said tool-carrying part, said spring being disposed in a, downwardly and forwardly extending line and having considerable initial resistance against buckling, and a tool fixed to said tool-carrying part and having a point positioned substantially in line with said spring forwardly and downwardly thereof.

3. In an agricultural implement, a tool-supporting part having a spring-receiving socket at the lower end of said part, a tool carrying part having a spring-receiving socket, a pair of forwardly facing abutment shoulders on said toolsupporting part on opposite sides of the associated socket, a second pair of abutment shoulders on said tool carrying part on opposite sides of the associated socket, said shoulders facing toward and contacting said first mentioned abutment shoulders on opposite sides of the associated socket, and a spring member fixed at one end in the spring receiving socket of said supporting part and fixed at its other end in the spring receiving socket in said tool-carrying part, and a tool fixed to said tool-carrying part and having a point positioned substantially in line with said spring.

THEOPI-IILUS BROWN.

REFERENCES CITED The following references are of record in the file of this patent: V V

UNITED STATES PATENTS Number Name Date 234,321 Nellis Nov. 9, 1880 1,013,410 Lynch Jan. 2, 1912 1,338,355 Benjamin Dec. 29, 1931 2,358,531 Orendorff Sept. 19, 1944 FOREIGN PATENTS Number Country Date 26,343 Great Britain 1912 

